While one of them is a cadre of the NSCN(K), the other three are associated with the proscribed Garo National Liberation Army (GNLA).
GNLA chief Sohan D Shira has inducted the three specifically to help smuggling arms from Dimapur for the outfit.
IG (Operations) G H P Raju said the four were arrested in an early raid yesterday in Tura whey they were getting ready to go to Dimapur for bringing arms and ammunition for the GNLA, he said.
From their possession, police have recovered 12 rounds of AK ammunition, a GNLA demand note and Rs 1.5 lakh cash.
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The other three arrested persons were identified as Nobin D Sangma, Livingstone Ch Marak and Balgranj R Marak.
Police believe that Nobin used to go to Nagaland with his family members to smuggle weapons in his personal car to avoid suspicion and he had been able to befool the police this way on several occasions.